CN114073128B

CN114073128B - Cell reselection method, cell reselection device and storage medium

Info

Publication number: CN114073128B
Application number: CN202080001166.9A
Authority: CN
Inventors: 董贤东
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2024-06-04
Anticipated expiration: 2040-05-29
Also published as: KR20230010726A; CN114073128A; JP2023527843A; BR112022024220A2; US20230089127A1; WO2021237735A1; EP4161145A4; JP7429806B2; EP4161145A1

Abstract

The disclosure relates to a cell reselection method, a cell reselection device and a storage medium. The cell reselection method comprises the following steps: acquiring a reference distance of a cell, and determining an actual distance between a terminal and the center of the cell; and carrying out cell reselection according to the reference distance and the actual distance. The method and the device can be used for cell reselection by combining the distance condition of the terminal and the cell, and further can be suitable for NTN network cell reselection with large cell radius.

Description

Cell reselection method, cell reselection device and storage medium

Technical Field

The disclosure relates to the field of communication technologies, and in particular, to a cell reselection method, a cell reselection device and a storage medium.

Background

In the related art, for a terrestrial network, a terminal mainly performs cell reselection based on an S criterion and an R criterion.

With the development of 5G networks, non-terrestrial networks (Non-TERRESTRIAL NETWORKS, NTN) were introduced. For NTN networks, the cell radius is large, the terminal is at the center or edge of the cell, its reference signal received power (REFERENCE SIGNAL RECEIVED power, RSRP) or reference signal received quality (REFERENCE SIGNAL RECEIVED quality, RSRQ) difference is small, and the large cell radius results in a large cell overlap area. Thus, when a terminal moves to cause channel fading (e.g., occlusion), cell reselection based on the S-criterion and the R-criterion may result in the terminal making cell reselection back and forth between two cells, and if cell reselection is made based on the S-criterion and the R-criterion, it is difficult to configure reasonable cell reselection parameters.

Therefore, how to provide a cell reselection method suitable for NTN networks is a problem to be solved.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a cell reselection method, a cell reselection apparatus, and a storage medium.

According to a first aspect of an embodiment of the present disclosure, there is provided a cell reselection method, including:

acquiring a reference distance of a cell, and determining an actual distance between a terminal and the center of the cell; and carrying out cell reselection according to the reference distance and the actual distance.

In an embodiment, the cell includes a serving cell of the terminal, and the method further includes:

And in response to the cell selection level being greater than the reference signal received power signal level threshold value for starting the same-frequency measurement, the cell selection quality being greater than the reference signal received quality signal quality threshold value for starting the same-frequency measurement, and the reference distance of the serving cell being greater than the actual distance between the terminal and the center of the serving cell, selecting not to measure the same-frequency neighbor cell.

In another embodiment, the target cell obtained by performing cell reselection according to the reference distance and the actual distance satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

In yet another embodiment, the performing cell reselection according to the reference distance and the actual distance includes:

Determining R values of a plurality of cells according to an R criterion of cell reselection, wherein the cells comprise neighbor cells and service cells;

Responding to the determined neighbor cell R value being higher than the service cell R value, wherein the neighbor cell meets the S criterion of cell reselection, and selecting neighbor cells with reference distances being greater than or equal to the actual distances from the neighbor cells with R values being higher than the service cell R value;

Responding to the neighbor cells with the R value higher than the R value of the serving cell and with the reference distance larger than or equal to the actual distance, and selecting the neighbor cell with the largest R value from the neighbor cells with the reference distance larger than or equal to the actual distance as a reselected cell;

and in response to the fact that no neighbor cell with the reference distance larger than or equal to the actual distance exists in the neighbor cells with the R value higher than the R value of the service cell, cell reselection is performed according to the reference distance of the service cell and the actual distance between the terminal and the center of the service cell.

In yet another embodiment, cell reselection is performed according to a reference distance of a serving cell and an actual distance between a terminal and a center of the serving cell, including:

Responding to the fact that the reference distance of the service cell is larger than or equal to the actual distance between the terminal and the center of the service cell, and residing in the service cell; and responding to the fact that the reference distance of the service cell is smaller than the actual distance between the terminal and the center of the service cell, and selecting the neighbor cell with the largest R value from neighbor cells with R values higher than the R value of the service cell as a reselected cell.

Selecting a cell satisfying a cell selection level greater than 0, a cell selection quality greater than 0, and a reference distance greater than an actual distance; determining R values of a plurality of cells in the selected cells according to a cell reselection R criterion; and responding to the determined neighbor cell R value being higher than the R value of the serving cell, and selecting the neighbor cell with the largest R value from the neighbor cells with the R value being higher than the R value of the serving cell as a reselected cell.

In yet another embodiment, determining the actual distance of the terminal from the center of the cell comprises:

determining the position information of the terminal and acquiring the cell position information provided by the network equipment; and determining the actual distance between the terminal and the center of the cell according to the position information of the terminal and the cell position information.

Determining the position information of the terminal and sending the position information to network equipment; and acquiring the actual distance between the terminal and the cell center, which is determined by the network equipment according to the position information of the terminal and the cell position information.

In another embodiment, the acquiring the reference distance of the cell includes:

and acquiring the reference distance of the cell according to the system broadcast message of the service cell and/or the neighbor cell.

According to a second aspect of the embodiments of the present disclosure, there is provided a cell reselection method, including:

And transmitting a reference distance of the cell, wherein the reference distance is used for the terminal to reselect the cell according to the reference distance and the actual distance between the terminal and the center of the cell.

In one embodiment, the cell reselection method further includes: and transmitting cell position information, wherein the cell position information is used for determining the actual distance by the terminal.

In one embodiment, the cell reselection method further includes: acquiring position information of a terminal; determining the actual distance between the terminal and the cell center according to the position information of the terminal and the cell position information; and sending the actual distance to the terminal.

In yet another embodiment, the terminal reselects the target cell according to the actual distance between the terminal and the center of the cell and the reference distance, where the target cell satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

According to a third aspect of the embodiments of the present disclosure, there is provided a cell reselection apparatus, including:

An acquisition unit configured to acquire a reference distance of a cell and determine an actual distance between a terminal and a center of the cell; and a processing unit configured to perform cell reselection according to the reference distance and the actual distance.

In an embodiment, the cell comprises a serving cell of the terminal, the processing unit is further configured to:

In another embodiment, a target cell obtained by performing cell reselection according to the reference distance and the actual distance satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

In yet another embodiment, the processing unit is configured to perform cell reselection based on the reference distance and the actual distance in the following manner: determining R values of a plurality of cells according to an R criterion of cell reselection, wherein the cells comprise neighbor cells and service cells; responding to the determined neighbor cell R value being higher than the service cell R value, wherein the neighbor cell meets the S criterion of cell reselection, and selecting neighbor cells with reference distances being greater than or equal to the actual distances from the neighbor cells with R values being higher than the service cell R value; responding to the neighbor cells with the R value higher than the R value of the serving cell and with the reference distance larger than or equal to the actual distance, and selecting the neighbor cell with the largest R value from the neighbor cells with the reference distance larger than or equal to the actual distance as a reselected cell; and in response to the fact that no neighbor cell with the reference distance larger than or equal to the actual distance exists in the neighbor cells with the R value higher than the R value of the service cell, cell reselection is performed according to the reference distance of the service cell and the actual distance between the terminal and the center of the service cell.

In yet another embodiment, the processing unit is configured to perform cell reselection according to a reference distance of the serving cell and an actual distance of the terminal from a center of the serving cell in the following manner:

In yet another embodiment, the processing unit is configured to perform cell reselection based on the reference distance and the actual distance in the following manner:

In yet another embodiment, the obtaining unit is configured to determine the actual distance of the terminal from the cell center in the following manner:

In yet another embodiment, the obtaining unit is configured to obtain the reference distance of the cell in the following manner: and acquiring the reference distance of the cell according to the system broadcast message of the service cell and/or the neighbor cell.

According to a fourth aspect of the embodiments of the present disclosure, there is provided a cell reselection apparatus, including:

And the transmitting unit is configured to transmit a reference distance of the cell, wherein the reference distance is used for the terminal to reselect the cell according to the reference distance and the actual distance between the terminal and the center of the cell.

In one embodiment, the transmitting unit is further configured to: and transmitting cell position information, wherein the cell position information is used for determining the actual distance by the terminal.

In another embodiment, the cell reselection device further includes an acquisition unit and a processing unit, where the acquisition unit is configured to: and acquiring the position information of the terminal. The processing unit is further configured to: and determining the actual distance between the terminal and the center of the cell according to the position information of the terminal and the cell position information. The transmitting unit is further configured to: and sending the actual distance to the terminal.

In another embodiment, the target cell obtained by the terminal performing cell reselection according to the reference distance and the actual distance between the terminal and the center of the cell satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

According to a fifth aspect of the embodiments of the present disclosure, there is provided a cell reselection apparatus, including:

a processor; a memory for storing processor-executable instructions;

wherein the processor is configured to: the cell reselection method of the first aspect or any implementation manner of the first aspect is performed.

According to a sixth aspect of the embodiments of the present disclosure, there is provided a cell reselection apparatus, including:

a processor; a memory for storing processor-executable instructions;

Wherein the processor is configured to: the cell reselection method of the second aspect or any one of the embodiments of the second aspect is performed.

According to a seventh aspect of the disclosed embodiments, there is provided a non-transitory computer readable storage medium, which when executed by a processor of a mobile terminal, causes the mobile terminal to perform the cell reselection method of the first aspect or any one of the embodiments of the first aspect.

According to an eighth aspect of the disclosed embodiments, there is provided a non-transitory computer readable storage medium, which when executed by a processor of a network device, causes the network device to perform the cell reselection method of the second aspect or any one of the embodiments of the second aspect.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: the terminal performs cell reselection according to the reference distance of the cell and the actual distance between the terminal and the center of the cell, so that the cell reselection is performed by combining the distance condition of the terminal and the cell, and the terminal is further suitable for the cell reselection of the NTN network with large cell radius.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a diagram of a communication system architecture, according to an exemplary embodiment.

Fig. 2 is a flow chart illustrating a method of cell reselection in accordance with an exemplary embodiment.

Fig. 3 is a flow chart illustrating a method of cell reselection in accordance with an exemplary embodiment.

Fig. 4 is a flowchart illustrating a method for cell reselection based on a reference distance of a cell and an actual distance of a terminal from a center of the cell, according to an exemplary embodiment.

Fig. 5 is a flowchart illustrating a method for cell reselection based on a reference distance of a cell and an actual distance of a terminal from a center of the cell, according to an example embodiment.

Fig. 6 is a block diagram illustrating a cell reselection apparatus according to an exemplary embodiment.

Fig. 7 is a block diagram illustrating a cell reselection apparatus in accordance with an exemplary embodiment.

Fig. 8 is a block diagram illustrating an apparatus for cell reselection in accordance with an exemplary embodiment.

Fig. 9 is a block diagram of an apparatus according to an example embodiment.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

The information sending method provided by the embodiment of the disclosure can be applied to the wireless communication system shown in fig. 1. Referring to fig. 1, the wireless communication system includes a terminal and a network device. And information is sent and received between the terminal and the network equipment through wireless resources.

It will be appreciated that the wireless communication system shown in fig. 1 is only schematically illustrated, and that other network devices may be included in the wireless communication system, for example, a core network device, a wireless relay device, a wireless backhaul device, etc., which are not shown in fig. 1. The embodiments of the present disclosure do not limit the number of network devices and the number of terminals included in the wireless communication system.

It is further understood that the wireless communication system of the embodiments of the present disclosure is a network that provides wireless communication functionality. The wireless communication system may employ different communication techniques such as code division Multiple access (code division Multiple access, CDMA), wideband code division Multiple access (wideband code division Multiple access, WCDMA), time division Multiple access (time division Multiple access, TDMA), frequency division Multiple access (frequency division Multiple access, FDMA), orthogonal frequency division Multiple access (orthogonal frequency-division Multiple access, OFDMA), single carrier frequency division Multiple access (SINGLE CARRIER FDMA, SC-FDMA), carrier sense Multiple access/collision avoidance (CARRIER SENSE Multiple ACCESS WITH Collision Avoidance). Networks may be classified into 2G (english: generation) networks, 3G networks, 4G networks, or future evolution networks, such as 5G networks, according to factors such as capacity, rate, delay, etc., and the 5G networks may also be referred to as New Radio (NR). For convenience of description, the present disclosure will sometimes refer to a wireless communication network simply as a network.

Further, the network devices referred to in this disclosure may also be referred to as radio access network devices. The radio access network device may be: a base station, an evolved node B (bs), a home base station, an Access Point (AP) in a WIFI (WIRELESS FIDELITY) system, a wireless relay node, a wireless backhaul node, a transmission point (transmission point, TP), or a transmission reception point (transmission and reception point, TRP), etc., or may be a gNB in an NR system, or may also be a component or a part of a device that forms a base station, etc. In the case of a vehicle networking (V2X) communication system, the network device may also be an in-vehicle device. It should be understood that in the embodiments of the present disclosure, the specific technology and specific device configuration adopted by the network device are not limited.

Further, a Terminal referred to in the present disclosure may also be referred to as a Terminal device, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), or the like, and may be a device that provides voice and/or data connectivity to a User, for example, a handheld device, an in-vehicle device, or the like that has a wireless connection function. Currently, some examples of terminals are: a smart Phone (Mobile Phone), a pocket computer (Pocket Personal Computer, PPC), a palm computer, a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), a notebook computer, a tablet computer, a wearable device, or a vehicle-mounted device, or the like. In addition, in the case of a vehicle networking (V2X) communication system, the terminal device may also be an in-vehicle device. It should be understood that the embodiments of the present disclosure are not limited to the specific technology and specific device configuration adopted by the terminal.

The terminal may perform cell selection or reselection during communication with the network device. The embodiment of the disclosure is mainly applicable to a process of selecting or reselecting a cell. In the related art, S criteria and R criteria are involved for cell selection or reselection.

Where the S criterion mainly refers to Srxlev >0 and square >0. Where Srxlev is the cell selection level and square is the cell selection quality. The terminal selects or reselects a cell that needs to meet the S criterion.

Further, for the same frequency measurement of the terminal, if the serving cell satisfies: srxlev > SIntraSearchP and square > SIntraSearchQ, the terminal may choose not to measure co-frequency neighbor cells. Wherein sintraSearchP is the RSRP signal level threshold for initiating on-channel measurements, and sintraSearchQ is the RSRQ signal quality threshold for initiating on-channel measurements.

Wherein, the R criterion mainly refers to:

Rs＝Qmeas,s+Qhyst–Qoffsettemp，Rn＝Qmeas,n-Qoffset-Qoffsettemp

Wherein Rs is the R value of a serving cell, rn is the R value of a neighbor cell, qmeas, s is the RSRP measured value of the serving cell, qmeas, n is the RSRP measured value of the neighbor cell, qhyst is the cell reselection hysteresis value, qoffsettemp is the temporary offset value; qoffset is an offset value. The protocol specifications Qmeas, qoffset and Qoffsettemp are shown in table 1.

TABLE 1

The above-described manner of cell reselection based on the S criterion and the R criterion is mainly applicable to terrestrial networks. But with the development of communication technology, NTN networks were introduced. The network characteristics for NTN networks are large cell radius. For NTN networks with large cell radius, the terminal is at the center or edge of the cell, its RSRP or RSRQ difference is small, and the large cell radius results in a large cell overlap area. Thus, when a terminal moves to cause channel fading (e.g., occlusion), cell reselection based on the S-criterion and the R-criterion may result in the terminal making cell reselection back and forth between two cells, and if cell reselection is made based on the S-criterion and the R-criterion, it is difficult to configure reasonable cell reselection parameters.

Therefore, for the NTN network, due to the network characteristics, the cell reselection mode based on the S criterion and the R criterion cannot well solve the problem encountered by the terminal when the NTN network performs cell selection/reselection.

In view of this, an embodiment of the present disclosure provides a cell reselection method, where a network device provides reference location information of a cell to a terminal, where the reference location information is used to determine a reference distance of the cell. The reference distance represents a distance that the cell can provide good network service. When the actual distance between the terminal and the center of the cell is smaller than the reference distance, the cell can provide good network service for the terminal. A cell providing good network service may be understood as a cell signal quality above a specified signal quality threshold. The reference distance provided by the network is typically smaller than the actual coverage distance of the cell, which is characterized by the cell radius. When the terminal performs cell reselection, the terminal performs cell reselection according to the reference distance of the cell and the actual distance between the terminal and the center of the cell, and can perform cell reselection by combining the distance condition of the terminal and the cell, so that the terminal is applicable to cell reselection of an NTN network with a large cell radius.

Fig. 2 is a flow chart illustrating a method of cell reselection according to an exemplary embodiment, including the following steps as shown in fig. 2. The cell reselection method shown in fig. 2 may be applied to a terminal, and of course, may also be applied to other devices that may perform the following related methods.

In step S11, a reference distance of the cell is acquired, and an actual distance of the terminal from the center of the cell is determined.

In the embodiment of the present disclosure, the cell corresponding to the acquired reference distance and the actual distance may be a serving cell of the terminal, or may be a neighboring cell of the terminal, or may be understood as a candidate cell included in a candidate list for performing cell reselection.

The reference distance may be determined by cell reference location information provided to the terminal by the NTN network. Wherein the reference location information of the cell may be defined by the network device by a system broadcast message. In the embodiment of the present disclosure, the reference location information of the cell is mainly used to determine the reference distance of the cell, and the reference location information of the cell and the reference distance of the cell are sometimes used interchangeably, but those skilled in the art will understand the meaning.

In step S12, cell reselection is performed according to the reference distance of the cell and the actual distance of the terminal from the center of the cell.

In the embodiment of the disclosure, when the terminal performs cell reselection, the terminal performs cell reselection according to the reference distance of the cell and the actual distance between the terminal and the center of the cell, so as to perform cell reselection by combining the distance condition of the terminal and the cell, so as to be suitable for cell reselection of an NTN network with a large cell radius.

Fig. 3 is a flow chart illustrating a method of cell reselection, as shown in fig. 3, according to an exemplary embodiment, including the following steps. The cell reselection method shown in fig. 3 may be applied to a network device, and of course, may also be applied to other devices that may perform the following related methods.

In step S21, a reference distance of the cell is transmitted, and the reference distance is used for the terminal to reselect the cell according to the reference distance and the actual distance between the terminal and the center of the cell.

In one example, the network device provides the reference distance of the cell through a system broadcast message. And the terminal acquires the reference distance of the cell according to the system broadcast message of the service cell and/or the neighbor cell.

In another example, the actual distance between the terminal and the center of the cell may be determined by the terminal according to the actual location of the terminal and the actual location information of the cell, or may be determined by the network device according to the actual location of the terminal and the actual location information of the cell.

When determining according to the actual position of the terminal and the actual position information of the cell, the terminal determines the position information of the terminal and acquires the cell position information provided by the network equipment. Wherein the cell location information provided by the network device may be determined by ephemeris information (network location information of the cell) included in the system broadcast message. The network device sends cell location information to the terminal. The terminal acquires the cell position information, and determines the actual distance between the terminal and the center of the cell according to the position information of the terminal and the cell position information.

When the network equipment determines according to the actual position of the terminal and the actual position information of the cell, the terminal determines the position information of the terminal and sends the position information of the terminal to the network equipment. The terminal may report the location information of the terminal to the network device according to the measurement of the terminal, such as the report of the terminal and the measurement value related to the location. The network device obtains the location information of the terminal, and determines the actual distance between the terminal and the center of the cell according to the location information of the terminal and the location information (ephemeris information) of the cell. The network device obtains the position information of the terminal and can report and determine the position information of the terminal according to the measurement of the terminal. For example, the network device calculates the location information of the terminal according to the measurement value reported by the terminal and related to the location. After the network equipment determines the actual distance between the terminal and the cell center, the network equipment sends the determined actual distance between the terminal and the cell center to the terminal. The terminal obtains the actual distance between the terminal and the cell center, which is determined by the network equipment according to the position information of the terminal and the cell position information, so as to determine the actual distance between the terminal and the cell center.

The cell reselection method according to the above embodiment is described below in connection with practical applications.

For convenience of description in the embodiment of the present disclosure, dref is used to represent the reference distance of the cell, and Dmeasure represents the actual distance between the terminal and the center of the cell.

In the embodiment of the disclosure, when cell reselection is performed according to two parameters of Dref and Dmeasure, a measurement condition that the terminal does not start the measurement of the co-frequency neighbor cell can be determined according to Dref and Dmeasure. In an example, after determining Dref of the serving cell and Dmeasure of the terminal and the center of the serving cell, the terminal may choose not to measure the co-frequency neighbor cell when Srxlev > sintrasetchp and square > sintrasetchq, and Dref > Dmeasure. That is, in response to the serving cell of the terminal satisfying Srxlev > SIntraSearchP, and square > SIntraSearchQ, and Dref > Dmeasure, the terminal may choose not to make measurements on co-frequency neighbor cells.

In the embodiment of the present disclosure, when performing cell reselection according to two parameters of Dref and Dmeasure, a condition that needs to be met by a cell obtained by performing cell reselection may be determined according to Dref and Dmeasure. In an example, for example, a cell reselection according to Dref and Dmeasure satisfies: dref > Dmeasure. Further, in the embodiment of the present disclosure, the cell obtained by performing cell reselection needs to satisfy the S criterion, that is, the cell obtained by performing cell reselection according to Dref and Dmeasure needs to satisfy Srxlev >0, and square >0, and Dref > Dmeasure.

In the embodiment of the present disclosure, the cell performing cell reselection according to Dref and Dmeasure may be understood as a candidate cell included in a candidate list performing cell reselection according to S criteria, where the candidate cell may include a serving cell of a terminal or may include a neighbor cell of the terminal. The target cell obtained by cell reselection according to Dref and Dmeasure can be understood as one of the cells satisfying the S criterion.

It is further understood that the criteria involved in cell reselection by Dref > Dmeasure in embodiments of the present disclosure that Srxlev >0 and Squal >0 are satisfied may be a newly defined S criteria. The newly defined S criteria may be:

Srxlev >0 and square >0 and D >0.

Wherein d=dref-Dmeasure. Dmeasure is the distance between the terminal and the center of the target cell, dref is the reference distance of the target cell, srxlex is the target cell selection level, and square is the target cell selection quality. It will be appreciated that the cell obtained by cell reselection according to Dref and Dmeasure in the embodiments of the present disclosure needs to satisfy the newly defined S criterion.

It is further understood that, in the embodiment of the present disclosure, the cell obtained by performing cell reselection according to Dref and Dmeasure may be a serving cell before the terminal performs cell reselection, or may be a neighbor cell of the terminal.

In one implementation, in the embodiment of the present disclosure, after cell reselection according to the existing S criterion and R criterion, cell reselection may be performed by combining Dref and Dmeasure.

Fig. 4 shows a schematic flow chart of cell reselection according to Dref and Dmeasure shown in an exemplary embodiment of the present disclosure. Referring to fig. 4, the method comprises the following steps.

In step S31, the terminal determines R values of a plurality of cells including neighbor cells and serving cells according to an R criterion of cell reselection.

In step S32, in response to the existence of the neighbor cell with the R value higher than the R value of the serving cell and the neighbor cell meeting the S criterion of cell reselection, the terminal selects the neighbor cell with the Dref not less than Dmeasure from the neighbor cells with the R value higher than the R value of the serving cell.

The terminal needs to combine Dref and Dmeasure to determine whether to reselect to the neighbor cell or not. For example, the terminal selects a neighbor cell having Dref. Gtoreq. Dmeasure from among neighbor cells having R values higher than that of the serving cell.

When the terminal selects the neighbor cell with Dref more than or equal to Dmeasure from the neighbor cells with R value higher than the R value of the serving cell, whether the neighbor cell is selected as a reselected cell can be determined according to whether the neighbor cell with Dref more than or equal to Dmeasure exists in the neighbor cells with R value higher than the R value of the serving cell.

In step S33a, in response to the existence of the neighbor cell with Dref not less than Dmeasure in the neighbor cells with R value higher than the R value of the serving cell, selecting the neighbor cell with the largest R value from the neighbor cells with Dref not less than Dmeasure as the reselected cell.

In step S33b, in response to the absence of a neighbor cell with Dref being greater than or equal to Dmeasure in a neighbor cell with R value higher than that of the serving cell, cell reselection is performed according to Dref and Dmeasure of the serving cell.

In one example, when cell reselection is performed according to Dref and Dmeasure of the serving cell, the cell is camped on the serving cell in response to the actual distance of Dref of the serving cell being greater than or equal to Dmeasure. And responding to Dref < Dmeasure of the serving cell, and selecting the neighbor cell with the largest R value from neighbor cells with R values higher than the R value of the serving cell as a reselected cell.

In an exemplary embodiment, the terminal ranks the R values of the plurality of cells according to an R criterion. If the R value of N adjacent cells is higher than that of the serving cell, P cells meeting Dref is more than or equal to Dmeasure are selected from the N adjacent cells. And selecting the cell with the largest R value from the P cells, and if P is more than 0, reselecting the selected cell with the largest R value by the terminal. If p=0 (i.e. no neighbor cell satisfies Dref. Gtoreq Dmeasure at this time), if the serving cell satisfies Dref. Gtoreq Dmeasure, the terminal still resides in the serving cell and does not perform cell reselection. If the serving cell does not meet Dref is larger than or equal to Dmeasure (Dref < Dmeasure), the terminal reselects to the cell with the largest R value in the N cells.

According to the embodiment of the disclosure, the method for reselecting the cell can be used for reselecting the neighbor cell when the R value of the neighbor cell is larger than the service cell and the reference distance of the neighbor cell is larger than or equal to the actual distance. Further, it is also possible to implement camping on the serving cell if the serving cell meets the distance requirement in response to the neighbor cell not meeting the distance requirement between Dref and Dmeasure. And in response to the neighbor cells not meeting the distance requirement between Dref and Dmeasure and the serving cell also not meeting the distance requirement, camping on the neighbor cell with high R value.

In another embodiment, the terminal may perform cell reselection according to a newly defined S criterion.

Fig. 5 shows a schematic flow chart of cell reselection according to Dref and Dmeasure shown in an exemplary embodiment of the present disclosure. Referring to fig. 5, the method comprises the following steps.

In step S41, the terminal selects a cell satisfying the newly defined S criterion according to the newly defined S criterion (Srxlev >0 and square >0 and D > 0).

In step S42, R values of a plurality of cells are determined according to a cell reselection R criterion among the selected cells satisfying the newly defined S criterion.

In step S43, in response to the determined neighbor cell R value being higher than the serving cell R value, the neighbor cell with the largest R value is selected as the reselected cell among the neighbor cells with R values higher than the serving cell R value.

In the embodiment of the disclosure, when the terminal performs cell reselection according to Dref and Dmeasure, dref and Dmeasure are applied to neighbor cell measurement, and the S criterion and the R criterion can be applied to NTN network cell reselection with a large cell radius. Selecting a cell satisfying Dref > Dmeasure can avoid the terminal from reselecting the cell back and forth between the two cells.

The cell reselection method provided by the embodiment of the disclosure is also suitable for the interaction process of the terminal and the network equipment. In one example, the network device defines Dref by a system broadcast message. The terminal acquires Dref of each cell from a system broadcast message of a serving cell and/or a neighboring cell, and acquires ephemeris information (location information of the cell) from the system broadcast message. The terminal determines its location, e.g. its own location from GPS, in combination with ephemeris information obtained from the network device to determine Dmeasure its location with the cell center. When the terminal performs cell selection or reselection, selecting a plurality of cells meeting the newly defined S criteria related in the scheme, applying R criteria to the selected cells, reselecting the terminal to the cell with the largest R value, and if the cell with the largest R value is the current service cell, not performing cell reselection by the terminal, and still residing in the current cell. Or when the terminal performs cell selection or reselection, selecting a plurality of cells meeting the existing S criterion, applying R criterion to the selected cells, and then performing cell reselection by combining Dref and Dmeasure.

The process of implementing paging in the unlicensed band or the licensed band by the terminal and the network device in an interaction manner in the embodiments of the present disclosure may refer to the related description of the embodiments, which is not repeated herein.

According to the same conception, the embodiment of the disclosure also provides a cell reselection device.

It can be appreciated that, in order to implement the above-mentioned functions, the cell reselection apparatus provided in the embodiments of the present disclosure includes corresponding hardware structures and/or software modules that perform the respective functions. The disclosed embodiments may be implemented in hardware or a combination of hardware and computer software, in combination with the various example elements and algorithm steps disclosed in the embodiments of the disclosure. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not to be considered as beyond the scope of the embodiments of the present disclosure.

Fig. 6 is a block diagram of a cell reselection apparatus, according to an example embodiment. Referring to fig. 6, the cell reselection apparatus 100 includes an acquisition unit 101 and a processing unit 102. Wherein the acquiring unit 101 is configured to acquire a reference distance of the cell and determine an actual distance of the terminal from the center of the cell. A processing unit 102 configured to perform cell reselection based on the reference distance and the actual distance.

In an embodiment, the cells comprise serving cells of the terminal, and the processing unit 102 is further configured to: and in response to the cell selection level being greater than the reference signal received power signal level threshold value for starting the same-frequency measurement, the cell selection quality being greater than the reference signal received quality signal quality threshold value for starting the same-frequency measurement, and the reference distance of the serving cell being greater than the actual distance between the terminal and the center of the serving cell, selecting not to measure the same-frequency neighbor cell.

In yet another embodiment, the processing unit 102 is configured to perform cell reselection according to the reference distance and the actual distance in the following manner: and determining R values of a plurality of cells according to R criteria of cell reselection, wherein the plurality of cells comprise neighbor cells and serving cells. And in response to the determined neighbor cell R value being higher than the serving cell R value, and the neighbor cell meeting the S criterion of cell reselection, selecting a neighbor cell with a reference distance greater than or equal to the actual distance from among the neighbor cells with R values higher than the serving cell R value. And in response to the existence of the neighbor cell with the reference distance larger than or equal to the actual distance in the neighbor cells with the R value larger than the R value of the serving cell, selecting the neighbor cell with the largest R value from the neighbor cells with the reference distance larger than or equal to the actual distance as the reselected cell. And in response to the fact that no neighbor cell with the reference distance larger than or equal to the actual distance exists in the neighbor cells with the R value higher than the R value of the serving cell, cell reselection is performed according to the reference distance of the serving cell and the actual distance between the terminal and the center of the serving cell.

In yet another embodiment, the processing unit 102 is configured to perform cell reselection according to the reference distance of the serving cell and the actual distance of the terminal from the center of the serving cell in the following manner:

and in response to the reference distance of the serving cell being greater than or equal to the actual distance of the terminal from the center of the serving cell, camping on the serving cell. And responding to the fact that the reference distance of the serving cell is smaller than the actual distance between the terminal and the center of the serving cell, and selecting the neighbor cell with the largest R value from neighbor cells with R values higher than the R value of the serving cell as a reselected cell.

In yet another embodiment, the processing unit 102 is configured to perform cell reselection according to the reference distance and the actual distance in the following manner:

A cell is selected that satisfies a cell selection level greater than 0, a cell selection quality greater than 0, and a reference distance greater than an actual distance. And determining R values of a plurality of cells according to a cell reselection R criterion in the selected cells. And in response to the determined neighbor cell R value being higher than the R value of the serving cell, selecting the neighbor cell with the largest R value from the neighbor cells with the R value being higher than the R value of the serving cell as a reselected cell.

In yet another embodiment, the acquisition unit 101 is configured to determine the actual distance of the terminal from the cell center in the following way:

And determining the position information of the terminal and acquiring the cell position information provided by the network equipment. And determining the actual distance between the terminal and the center of the cell according to the position information of the terminal and the position information of the cell.

In yet another embodiment, the acquisition unit 101 is configured to determine the actual distance of the terminal from the cell center in the following way: and determining the position information of the terminal and sending the position information to the network equipment. And acquiring the actual distance between the terminal and the cell center, which is determined by the network equipment according to the position information of the terminal and the cell position information.

In yet another embodiment, the obtaining unit 101 is configured to obtain the reference distance of the cell in the following manner: and acquiring the reference distance of the cell according to the system broadcast message of the service cell and/or the neighbor cell.

Fig. 7 is a block diagram of a cell reselection apparatus, according to an example embodiment. Referring to fig. 7, the cell reselection apparatus 200 includes a transmission unit 201.

And a transmitting unit 201 configured to transmit a reference distance of the cell, where the reference distance is used for the terminal to reselect the cell according to the reference distance and an actual distance between the terminal and a center of the cell.

In one embodiment, the sending unit 201 is further configured to: and transmitting cell position information, wherein the cell position information is used for determining the actual distance by the terminal.

In another embodiment, the cell reselection device 200 further includes a receiving unit 203 and a processing unit 202. The receiving unit 203 is configured to: and acquiring the position information of the terminal. The processing unit 202 is further configured to: and determining the actual distance between the terminal and the center of the cell according to the position information of the terminal and the cell position information. The transmitting unit is further configured to: the actual distance is sent to the terminal.

In yet another embodiment, the terminal reselects the target cell according to the actual distance between the terminal and the center of the cell and the reference distance, and the target cell satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.

Fig. 8 is a block diagram illustrating an apparatus 300 for cell reselection, according to an example embodiment. For example, apparatus 300 may be a mobile phone, computer, digital broadcast terminal, messaging device, game console, tablet device, medical device, exercise device, personal digital assistant, or the like.

Referring to fig. 8, the apparatus 300 may include one or more of the following components: a processing component 302, a memory 304, a power component 306, a multimedia component 308, an audio component 310, an input/output (I/O) interface 312, a sensor component 314, and a communication component 316.

The processing component 302 generally controls overall operation of the apparatus 300, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 302 may include one or more processors 320 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 302 can include one or more modules that facilitate interactions between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate interaction between the multimedia component 308 and the processing component 302.

Memory 304 is configured to store various types of data to support operations at apparatus 300. Examples of such data include instructions for any application or method operating on the device 300, contact data, phonebook data, messages, pictures, videos, and the like. The memory 304 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.

The power component 306 provides power to the various components of the device 300. The power components 306 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 300.

The multimedia component 308 includes a screen between the device 300 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 308 includes a front-facing camera and/or a rear-facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the apparatus 300 is in an operational mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

The audio component 310 is configured to output and/or input audio signals. For example, the audio component 310 includes a Microphone (MIC) configured to receive external audio signals when the device 300 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, audio component 310 further comprises a speaker for outputting audio signals.

The I/O interface 312 provides an interface between the processing component 302 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.

The sensor assembly 314 includes one or more sensors for providing status assessment of various aspects of the apparatus 300. For example, the sensor assembly 314 may detect the on/off state of the device 300, the relative positioning of the components, such as the display and keypad of the device 300, the sensor assembly 314 may also detect a change in position of the device 300 or a component of the device 300, the presence or absence of user contact with the device 300, the orientation or acceleration/deceleration of the device 300, and a change in temperature of the device 300. The sensor assembly 314 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor assembly 314 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 314 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 316 is configured to facilitate communication between the apparatus 300 and other devices, either wired or wireless. The device 300 may access a wireless network according to a communication standard, such as WiFi,2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 316 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 316 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented according to Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 300 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for executing the methods described above.

In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as memory 304, including instructions executable by processor 320 of apparatus 300 to perform the above-described method. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

Fig. 9 is a block diagram illustrating an apparatus 400 for cell reselection, in accordance with an example embodiment. For example, the apparatus 400 may be provided as a network device, such as a base station or the like. Referring to fig. 9, the apparatus 400 includes a processing component 422 that further includes one or more processors, and memory resources represented by memory 432, for storing instructions, such as applications, executable by the processing component 422. The application program stored in memory 432 may include one or more modules each corresponding to a set of instructions. Further, the processing component 422 is configured to execute instructions to perform the above-described methods.

The apparatus 400 may also include a power component 426 configured to perform power management of the apparatus 400, a wired or wireless network interface 450 configured to connect the apparatus 400 to a network, and an input output (I/O) interface 458. The apparatus 400 may operate in accordance with an operating system stored in the memory 432, such as Windows Server, mac OS XTM, unixTM, linuxTM, freeBSDTM or the like.

In an exemplary embodiment, a non-transitory computer-readable storage medium is also provided, such as a memory 432, comprising instructions executable by the processing component 422 of the apparatus 400 to perform the above-described method. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

It is further understood that the term "plurality" in this disclosure means two or more, and other adjectives are similar thereto. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It is further understood that the terms "first," "second," and the like are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the expressions "first", "second", etc. may be used entirely interchangeably. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It will be further understood that "connected" includes both direct connection where no other member is present and indirect connection where other element is present, unless specifically stated otherwise.

It will be further understood that although operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1.A method of cell reselection, comprising:

acquiring a reference distance of a cell, and determining an actual distance between a terminal and the center of the cell;

Cell reselection is carried out according to the reference distance and the actual distance;

The cell includes a serving cell of the terminal, the method further comprising:

And in response to the cell selection level being greater than a reference signal received power signal level threshold value for starting the same-frequency measurement, the cell selection quality being greater than a reference signal received quality signal quality threshold value for starting the same-frequency measurement, and the reference distance of the serving cell being greater than the actual distance between the terminal and the center of the serving cell, selecting to not measure the same-frequency neighbor cell.

2. The cell reselection method according to claim 1, wherein the target cell obtained by performing cell reselection according to the reference distance and the actual distance satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

3. The cell reselection method according to claim 1 or 2, wherein said performing cell reselection according to said reference distance and said actual distance comprises:

4. A method for cell reselection according to claim 3, wherein said performing cell reselection based on a reference distance of a serving cell and an actual distance of a terminal from a center of the serving cell comprises:

Responding to the fact that the reference distance of the service cell is larger than or equal to the actual distance between the terminal and the center of the service cell, and residing in the service cell;

and responding to the fact that the reference distance of the service cell is smaller than the actual distance between the terminal and the center of the service cell, and selecting the neighbor cell with the largest R value from neighbor cells with R values higher than the R value of the service cell as a reselected cell.

5. The cell reselection method according to claim 1 or 2, wherein said performing cell reselection according to said reference distance and said actual distance comprises:

selecting a cell satisfying a cell selection level greater than 0, a cell selection quality greater than 0, and a reference distance greater than an actual distance;

determining R values of a plurality of cells in the selected cells according to a cell reselection R criterion;

and responding to the determined neighbor cell R value being higher than the R value of the serving cell, and selecting the neighbor cell with the largest R value from the neighbor cells with the R value being higher than the R value of the serving cell as a reselected cell.

6. The cell reselection method of claim 1, wherein the determining an actual distance of the terminal from the cell center comprises:

determining the position information of the terminal and acquiring the cell position information provided by the network equipment;

And determining the actual distance between the terminal and the center of the cell according to the position information of the terminal and the cell position information.

7. The cell reselection method of claim 1, wherein the determining an actual distance of the terminal from the cell center comprises:

determining the position information of the terminal and sending the position information to network equipment;

and acquiring the actual distance between the terminal and the cell center, which is determined by the network equipment according to the position information of the terminal and the cell position information.

8. The method for cell reselection according to claim 1, wherein the obtaining the reference distance of the cell comprises:

9. A method of cell reselection, comprising:

Transmitting a reference distance of a cell, wherein the reference distance is used for a terminal to reselect the cell according to the reference distance and the actual distance between the terminal and the center of the cell;

10. The cell reselection method of claim 9, wherein the method further comprises:

and transmitting cell position information, wherein the cell position information is used for determining the actual distance by the terminal.

11. The cell reselection method of claim 9, wherein the method further comprises:

Acquiring position information of a terminal;

determining the actual distance between the terminal and the cell center according to the position information of the terminal and the cell position information;

And sending the actual distance to the terminal.

12. The cell reselection method according to any one of claims 9 to 11, wherein the target cell obtained by cell reselection by the terminal according to the reference distance and the actual distance between the terminal and the cell center satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

13. A cell reselection apparatus, comprising:

An acquisition unit configured to acquire a reference distance of a cell and determine an actual distance between a terminal and a center of the cell;

A processing unit configured to perform cell reselection according to the reference distance and the actual distance;

the cell comprises a serving cell of the terminal, the processing unit being further configured to:

14. The cell reselection apparatus of claim 13, wherein the target cell obtained by performing cell reselection according to the reference distance and the actual distance satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

15. The cell reselection apparatus according to claim 13 or 14, wherein the processing unit is configured to perform cell reselection based on the reference distance and the actual distance in the following manner:

16. The cell reselection apparatus of claim 15, wherein the processing unit is configured to perform cell reselection based on a reference distance of the serving cell and an actual distance of the terminal from a center of the serving cell in the following manner:

17. The cell reselection apparatus according to claim 13 or 14, wherein the processing unit is configured to perform cell reselection based on the reference distance and the actual distance in the following manner:

18. The cell reselection apparatus of claim 13, wherein the acquisition unit is configured to determine the actual distance of the terminal from the cell center by:

19. The cell reselection apparatus of claim 13, wherein the acquisition unit is configured to determine the actual distance of the terminal from the cell center by:

20. The cell reselection apparatus of claim 13, wherein the acquisition unit is configured to acquire the reference distance of the cell by:

21. A cell reselection apparatus, comprising:

a transmitting unit configured to transmit a reference distance of a cell, where the reference distance is used for a terminal to reselect a cell according to the reference distance and an actual distance between the terminal and a center of the cell;

the cell comprises a serving cell of the terminal, and the device further comprises a processing unit;

The processing unit is configured to: and in response to the cell selection level being greater than a reference signal received power signal level threshold value for starting the same-frequency measurement, the cell selection quality being greater than a reference signal received quality signal quality threshold value for starting the same-frequency measurement, and the reference distance of the serving cell being greater than the actual distance between the terminal and the center of the serving cell, selecting to not measure the same-frequency neighbor cell.

22. The cell reselection apparatus of claim 21, wherein the transmitting unit is further configured to:

23. The cell reselection apparatus of claim 21, further comprising an acquisition unit and a processing unit, the acquisition unit configured to: acquiring position information of a terminal;

the processing unit is further configured to: determining the actual distance between the terminal and the cell center according to the position information of the terminal and the cell position information;

the transmitting unit is further configured to: and sending the actual distance to the terminal.

24. The cell reselection device according to any of claims 21 to 23, wherein the target cell obtained by cell reselection by the terminal according to the reference distance and the actual distance between the terminal and the cell center satisfies: the cell selection level of the target cell is greater than 0, the cell selection quality of the target cell is greater than 0, and the reference distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

25. A cell reselection apparatus, comprising:

a processor;

A memory for storing processor-executable instructions;

Wherein the processor is configured to: a cell reselection method as claimed in any one of claims 1 to 8.

26. A cell reselection apparatus, comprising:

a processor;

A memory for storing processor-executable instructions;

Wherein the processor is configured to: the cell reselection method of any of claims 9 to 12.

27. A non-transitory computer readable storage medium, which when executed by a processor of a mobile terminal, causes the mobile terminal to perform the cell reselection method of any of claims 1 to 8.

28. A non-transitory computer readable storage medium, which when executed by a processor of a network device, causes the network device to perform the cell reselection method of any of claims 9 to 12.